U.K. vascular surgeon Eddie Chaloner later addressed online speculation that the swelled veins were the result of doping. He said that it's normal for an athlete of Huzarski's caliber to see such swelling.

"At rest, about one liter of blood goes up in the veins of the leg every minute. During intense exercise in elite athletes, this can increase more than ten-fold, making all the veins in the leg swell to accommodate the increased volume," he told fitness website Fiona Outdoors.

"The superficial veins, which you normally can't see, get dilated to cope with the excess demand and swell massively. Plus, of course these guys have less than five per cent body fat, so you can see all their veins even at rest," he added.

Think those photos are crazy? Check out the leg veins on American cyclist George Hincapie back in 2010.

Francois Lenoir / Reuters
American cyclist George Hincapie is seen during a training session for the Tour de France in 2010.

In Hincapie's case, another vascular surgeon told NBC News, that his varicose veins were likely the result of hours upon hours of sitting on a bike, which puts pressure on the veins.